Type 1:
A "Dangerous Forbidden Technique" that someone uses frequently without suffering the consequences. The Hero just uses it because he's just that awesome. Sometimes justified by the hero being able to avoid the drawbacks of the technique through experience or through unique abilities that cancel out the drawbacks. Other times, everyone seems to do it frequently, and so whatever made it forbidden is an Informed Attribute. Another possibility is that it's a case of the Centipede's Dilemma; the first time the Hero used it, he didn't know it was supposed to be dangerous, so he wasn't under the same sort of pressure that might have distracted him from doing it the right way, counterintuitive as it may seem.

Examples:

Type 1:

Naruto lives off this trope - forbidden technqiues are referred to as "kinjutsu" and may be either of the above types.

The title character knows two forbidden techniques, one of which he uses all the time from episode one onwards. For most people, it would be exhausting or potentially lethal, but he gets around it by having much more chakra. To his credit, the second one starts out very dangerous for him. But, of course, he finds a way to bypass the dangerous part, because he's frickin' Naruto.

There's also Rock Lee, who seems to suffer less and less as he continues to use the Lotus technique.

All three cases do have justifications: the Mass Shadow Clone technique Naruto knows seems to have been forbidden because it'll use up a jonin's chakra in a couple of minutes. Since he has the nine-tails, he has a lot of chakra...not to mention his own natural chakra reserves are way above that of a typical jonin. And years of interaction with the nine-tails' chakra has made them even stronger. The uber Wind-Element Rasengan got forbidden when, after using it the same way he used a normal Rasengan, it damaged Naruto's arm badly. So he learned to throw it at people instead. The lotus technique however would likely cause less strain on the body the older and stronger you got. Case in point, Guy used six chakra gates and was only as exhausted as pre-time skip Rock Lee was using three.

Kakashi was forbidden to use Chidori by the Fourth Hokage Minato Namikaze as it caused a tunnel-vision effect when used with regular eyes. Since gaining the Sharingan he has overcome this problem.

The Uchiha have developed so many "forbidden" techniques (all based around their Game Breaker bloodline ability) that it's a wonder they didn't all die out or go blind decades before they were massacred. Funnily enough, Danzo finds a clever way around the one that causes permanent blindness in exchange for the ability to warp reality: implant himself with multiple Sharingan eyes and use up their forbidden power like bullets in a gun...and store away the eyes of all the Uchiha clan members he had murdered as a way to "reload".

Filler character Guren uses multiple supposedly-life-sacrificing techniques consecutively, while bleeding heavily, without hindering her fighting ability much. She remains alive at the end of her arc.

Dragon Ball Z - the Kaio Ken (literally "World King Fist") technique briefly amplifies every aspect of the user's being - from physical strength to sense of taste. Goku is warned that his body may not be able to handle such a surge of power. While he does feel pretty bad the first few times he uses it, later on he suffers no such effects. By the time he fights Frieza he can stack the technique up to 20x its normal power and doesn't need to even call it anymore. King Kai has to explain to other characters observing the battle that no, he's not holding back he's been using it the whole time. In this case it is justified, due to Goku's Saiyan biology and the insane training he goes through that takes advantage of it. Breaking limits (thus reducing the forbiddenness of techniques) is kinda what he does.

Initially averted in Slayers. Lina's improvised ultimate spell, the Giga Slave, is at least noted as a way to deal with every big bad. However, because of its side effects, great effort is put into not using it because while the spell can destroy anything, it may very well destroy EVERYTHING. It ends up being used only thrice, once before its full ramifications are known (And really wouldn't be much worse than not using it had they known) with a number of additional measures backing it up, and once after an entire season's plot is devoted to driving Lina to cast it by the Monsters, who actively wish to see creation unmade, Lina botching it only to be saved by a literal Deus ex Machina she may have had an inkling of in advance. However, she casts it once again at the end of Slayers Evolution-R, pulling it off flawlessly with zero assistance.

Projection in Fate/stay night for Shirou; he keeps doing it and it says that it burns out his nerves and magic circuits and whatnot and yet it never permanently injures or kills him — Shirou himself postulates in "Unlimited Blade Works" that for all its Forbiddenness, the strain of doing it will never be enough to permanently harm him. Averted in Heaven's Feel, when Shirou has to depend on his Deadly Upgrade for Projection instead of doing it himself; the strain gives him brain damage and eventually destroys his body.

In One Piece, the main character Luffy has a technique called Gear Second that makes his blood pump faster, increasing his speed and power. In the first arc this appeared in, it was stated that using the technique wore him out, while also decreasing his lifespan. But by the Impel Down and Marineford arc, he's constantly using the technique, even when he doesn't really need to, with seemingly no side effects at all.

The true forbidden aspect of Gear Second only comes from over use. The technique basically dramatically accelerates Luffy's metabolism so his body overall performs better at the cost of consuming resources faster. In short amounts it only tires him (he can even quickly recover if there's food for him to eat) but if he uses it to the point of exhaustion, then KEEPS using it, it's like telling an oxygen deprived person to hold their breath.

During the Skypeia arc, one of the characters Wiper had a special weapon that could put out a lot of force, but which also backfired on the user. The weapon could potentially kill a user with one use. Throughout the saga, Wiper uses it three times, and though it injures him, it never takes him long to get back on his feet.

Using the Ginzouishou to its full power is said to be deadly in Sailor Moon, and it does kill Queen Serenity. On the other hand, Usagi uses it about once a season and, despite a few close calls, she always survives none the worse for wear.

Singing the Ultimate Song in Senki Zesshou Symphogear is supposed to kill the singer, or at least put her out of commission. By the end of the series, the protagonist trio use it twice in the same fight.

There are reasons for this, though they're not explored in the show. The ultimate song works by increasing the gear's power to levels that are dangerous to the user's body, but a Symphogear user whose compatibility with her gear is high enough can withstand it. Hence Tsubasa (naturally compatible) spends several days in the hospital, Hibiki (fused with her gear) can survive three at once, and Kanade (reliant on Super Serum) completely disintegrates.

MÄR has its titular character, Ginta, with his ultimate technique, third ÄRM, Gargoyle which turns Babo into an extremely powerful beast, complete with laser breath. He is warned early on (in a flashback) not to use it heavily, as it is taxing on him. First time he is seen using it, it drains him. Every other time after that, he's flashing it out so many times it's a wonder why he doesn't just start his fights with that and be done with it.

In Robert Jordan's The Wheel of Time series there exists a nasty spell called Balefire, which basically erases its target from existence. Retroactively, with Ripple Effect-Proof Memory. The more force you put into the spell, the farther back in time it goes. The heavy strain this spell put on the very fabric of existence was enough to get both sides—light and dark—to silently agree to stop using it long ago. For all its dangers, it can also be extremely useful. Several characters are saved (or revived) from death when their attacker is hit by this, it ignores defenses, and it's a guaranteed way to prevent the Forsaken from reincarnating. In small doses there aren't any apparent ill effects. It's only with massive blasts that the world seems to momentarily sway to the characters nearby.

And then in the last book it becomes painfully obvious why it was forbidden. The Dark One orders his followers to use lots of the stuff, and it does so much damage that the structure of reality itself begins to unravel. Egwene is forced to created a whole new spell called the Flame of Tar Valon to fix the damage, and though it works, using it kills her (though it also kills the bad guys who'd been using balefire at the time).

Max Impeller compensator rate in the Honor Harrington series is treated like this. Word of God is that it's a historical artifact from a previous era when going to the maximum rate really wasn't that safe and risked catastrophic failure of the compensator, which at 500G would turn you to paste. Of course we've never seen a ship have random failure in the entire series (Two short stories involve incidents where the compensator is broken on purpose, once as an assassination technique and once to maximize the damage of a ramming attack) even at max rate as modern designs don't need nearly the same margin for safety.

Star Trek: While not an attack, the Vulcan mind meld is originally set up this way. It can cause irreparable harm to the minds of both people. Nevertheless, it becomes part of Spock's standard tricks throughout the rest of the series, and becomes mundane even later. Even in the prequel it is used by someone who doesn't even know how without even a mention of harmful effects.

In Star Trek: Enterprise, however, T'Pol became mentally ill because an improperly done mind meld did damage to her mind, and the mind meld was considered a dangerous and bad technique and Vulcans capable of it shunned because it was done improperly so often that harmful side effects were a common result. So it turns out that the risks never played out in the original series because Spock is just that good. Apparently It Runs in the Family, as Spock's half-brother is able to mind-meld effortlessly, without even touching the target, and doesn't cause damage despite being insane.

In the first-season episode "Arena", Kirk's order to exceed the Enterprise's maximum safe cruising speed is heavily Played for Drama. Similar and higher speeds are used in later episodes with much less concern for the danger. Of course, this could be justified as the maximum "safe" rating being raised because it was proven that Constitution-class starships were able to exceed the current rating without ill effects.

In Star Trek: Deep Space Nine we're introduced to an organisation calling itself "section 31". It claims to have been created at the time of the Federation's founding, in order to act in secrecy to do what the Federation's principles won't allow it to do publicly. It's never made clear whether Section 31 is genuinely part of the Federation, whether the Federation knows about it, whether the intelligence networks of other species like the Tal'Shiar and the Obsidian Order know about them or even if Section 31 is an organisation and not a fancy name used by the one agent we meet who claims to be part of it.

Though this is averted in the Expanded Universe (where much of its role and history is established) and the rebooted timeline (where it has not only a headquarters on Earth, but is openly discussed between Kirk and an Admiral).

In Kamen Rider OOO, each third of the suit has different modes (instead of the entire suit like most riders). The mechanism is too complicated to go into, but using three of a kind is very powerful and very likely to kill you or drive you mad. And usually, Eiji is warned not to, does it anyway, and may faint afterward. He might act more feral for the first few seconds of its use, too. However, by this point, two episodes don't pass without the use of it, and it seems to be no big deal. He later gains another combo which is even more dangerous than the normal ones, but apart from sending him into an Unstoppable Rage the first few times it follows the same pattern. The source of this power on the other hand...

Especially for Kamen Rider, where such things are often as bad as they're said to be (you really do die if as a normal, unaltered human you use the Dark Kiva or Kaixa powers.)

In videogames you sometimes get to use the dangerous forbidden stuff without ramifications because they don't want to limit the player's freedom of choice.

Jedi Academy: Your teachers get worried if you learn many Dark Side powers, but whether you fall to the dark side in the end is entirely up to player choice.

World of Warcraft: The warlock class. Summoning demonic servants and tormenting your enemies with dark curses places your soul in no peril if you're a player character.

Players in-game don't know much one way or another about the state of their soul, so maybe warlocks are damned, along with everyone who completes the torture quests; we never find out. And warlocks do pay a price for their power, or at least they used to before the Doomguard summoning spell was changed, and there's always Life Tap.

Mentioned below in Type 2 is the Final Fantasy XIBlue Mage, but what is discussed even less is the implication that pursuing this path will also turn the person into a Mind Flayer upon their death, or if they grow too strong.

Also, in-story, summoning magic is considered forbidden by law in the Federation of Windurst because of the horrendous risk involved with its use: it is apparently rather easy to overexert oneself while summoning, thus causing the summon to drain the Summoner's life force and kill them. However, neither the legal nor physical ramifications of summoning magic ever catch up with player Summoners, who can summon to their heart's content.

Invoked in Trauma Center: Under the Knife when Doctor Kasal declares Derek's healing touch a Dangerous Forbidden Technique... then in his very next breath admits he's perfectly aware Derek will merrily ignore this if a life is on the line (and as a surgeon, it often is), and explains he's just trying to stop Derek using it as a crutch. (As well as obliquely telling the player it impacts their score.)

In the Naruto Shippuden Ultimate Ninja Storm series, the above Naruto entry gets taken Up to Eleven with Ultimate Ninjutsu and AwakeningMode. Naruto can spam the aforementioned Wind Style: Rasenshuriken without showing (or taking, in gameplay) any damage. And that's just the tip of the iceberg. Kyuubi Mode & Cursed Seal Mode? Sure! A forbidden technique which sacrifices your soulto seal the enemy's? As many times as you like! (well, until they die... from the fifth hit with it...). Part one Sasuke using Chidori twenty times in a match? Well, you've got to suck to need that many tries, but two times a day my ass... Mangekyo Sharingan? Nothing more than a wince... The list goes on and on.

Type 2:

In Fullmetal Alchemist, human transmutation is forbidden due to the ethical ramifications. It usually kills you. If not, the Gate/Truth takes part of your body as payment, but it turns out the government forbids it only because they don't want alchemists creating their own armies. Armies of soldiers who are quite literally powered by forsaken children (at least some of them). Transmuting precious metals is forbidden because of the potential damage it can do to the economy.

In the 2003 anime version, attempting human transmutation still takes part of your body as payment (unless you have a Philosopher's Stone) but instead creates a homunculus without accomplishing whatever it was you were trying to accomplish.

Played for laughs in Ranma ½, where Happosai, after having declared the "Happo Fire Burst" technique illegal and unfit to be used, digs it up again after being ticked off at Ranma and it becomes his main combat technique thereafter. It was only illegal because Happosai decided it was illegal, and he only declared it illegal because he once burned up some stolen lingerie with it by accident.

In His Dark Materials: touching someone else's dæmon is given this treatment (sort-of), though admittedly mostly by the villains. In book one, it's treated as a case of "Never, ever, ever. Not even in battle, when trying to kill another soldier, will you touch his dæmon." By the time of book three, the standard seems to have been significantly relaxed - then there's the odd times when a dæmon will initiate contact with another human. In the companion book Once Upon a Time In The North, the villain talks about the number of times he's manhandled other men's dæmons to torture them. However, one could argue that the standards for touching someone else's dæmon have always been at the levels that are shown in book 3, but Lyra, being a child, was just unaware of them. On the other hand, in The Amber Spyglass when Ama uses the tail of her own dæmon to brush a wake-up powder on Lyra's nostrils — why couldn't she have brought her own brush??

Given that many some of the incidents in which people touch others' demons have sexual overtones (When a mook touches Lyra's daemon, the phrasing used could have applied to him molesting her just as easily, Will and Lyra touch each other's daemons just before doing... something related to love out in the forest,) this could have some interesting connotations.

In the Discworld novel Wyrd Sisters, Granny Weatherwax mentions that they can't restore the rightful heir to the throne of Lancre by using magic. Then they have to use quite a lot of magic to get the rightful heir back to Lancre so he can get his own damn throne back (whether he wants it or not). As Nanny Ogg says, "When you break rules, break 'em good and hard."

In Witches Abroad, when Magrat again complains about Granny Weatherwax meddling in things she says witches aren't meant to meddle in, Nanny explains it's all down to the difference between the general and the specific. "When Esme uses words like 'everyone' and 'no-one', she ain't including herself." Mind you, earlier in the same book Magrat offered the highly questionable rationalisation "It can't be bad if we're doing it. We're the good ones."

There's a subplot in Survivor's Quest where Luke, three years married to Mara Jade and happy about it, is aware of the Jedi's stance against attachment, including love and marriage. One of the reasons he's eager to visit the ruins of the Jedi-headed Outbound Flight is his hope of finding intact, unaltered Jedi records which might, just possibly, have something in them about Jedi who disagreed with this stance.

In the final Harry Potter book, Harry and his friends start firing off "unforgivable" curses pretty freely. Though given the change in ministry administration, they may not even be illegal to use anymore.

It is suggested that in times of war, restrictions on the use of Unforgiveable Curses are lifted. It is also mentioned that Aurors were legally given free rein to use them during Voldemort's last attack.

Also prevalent in the movies where villains are frequently vaporised by magic or magically torn to pieces by heroes. But it's all fine so long as nobody uses the "instant painless death" curse.

The implication in the books is that while anyone can tear someone limb from limb, the killing curse is inherently evil, as it is fueled by the desire to end a life.

Dumbledore and McGonagall have a conversation to this effect in the first book, where Dumbledore claims that "Voldemort has powers I will never have", in response to being called the greatest wizard alive. McGongall counters that Dumbledore most certainly could use said powers, but since they're inherently evil, he never would.

In Guy Gavriel Kay's epic novel Tigana, Alessan enslaves a wizard in order to save the world (or actually, just one country).

There were, however, a number of episodes (none in the Original Series...) that subverted this, with the captain indeed trying to enforce the Prime Directive in morally... troubling circumstances. The implications were often very disturbing. (Stop a deadly illness that we've got a cure for from wiping out an entire civilization? But that would be playing god! Save a primitive society of millions from a supernova? But we don't want to interfere! Etc.)

More disturbingly, this also happened in Enterprise when the Prime Directive didn't even exist yet! No rule was forcing him to act this way at all... it came across more like he just didn't want to help anybody and helped derive the Prime Directive as an excuse!

TOS had at least one episode where Starfleet Command, rather than the captain, explicitly bent the Prime Directive for the greater good (it also had an episode indicating that saving primitive societies from extinction via natural disaster is mandated rather than prohibited by that era's Prime Directive).

The ending was changed from actually saving the species to what it became due to Executive Meddling.

There are several rules to Time Travel in Continuum, and one very specific rule is to avoid Frag and fix any encountered. Only a Narcissist would be so vile as to intentionally risk the lives and futures of the universe for their own selfish ends. And then most time combat is about fragging the opponent as fast and as hard as possible, often to the point where the enemy is little more than semi-aware goo swaying through the true universe they are now barely able to touch. Unlike most cases, this is called out, although the danger presented by and difficultly in defeating normally a Narcissist makes it a Necessarily Evil.

This can be easily applied to players in Video Games, as while the story has ethical ramifications, it's not actually real, but most gamers couldn't care less in their pursuit of shinies. Case in point: In Final Fantasy XI, becoming a Blue Mage is seen as power-hungry and amoral (you pretty much sell your soul for it). Of course, nobody cares, because BLU is one of the most asked-for jobs andIwantmyBlueMagedammit!

In Final Fantasy X, Wakka informs Tidus that it's taboo to enter the Chamber of the Fayth unless you're a summoner, but he's ignored every time. Ultimately, it turns out the taboos were put there in the first place for very bad reasons...

Tidus: You can stuff your taboos!

A more practical reason might be simply not wanting people going in unnecessarily, since the chambers tend to be death traps and they want to minimize casualties. You can get roasted alive in Kilika, electrocuted in Djose, frozen and left for dead in Macalania, and fall into a for-all-points-and-purposes bottomless pit in Bevelle. Besaid, though, doesn't have a justification for this other than the whole "Yevon says so" line.

In Dragon Age: Origins, people talk a whole lot about how evil blood magic is. You can nonetheless walk around with a party of 3 blood mages, and nobody will bother you about it. In fact, nobody will even seem to notice, no matter how blatant you are about your use of forbidden and dangerous magic, not even the Templars who are supposed to kill blood mages on sight, including one of your party members who used to belong to said organisation!

However, the Warden's Keep DLC adventure mentions that the Grey Wardens don't forbid blood magic, as they will permit any advantage they can get over the Darkspawn. This, and the fact that the Wardens actively encourage Mages to throw off the leash and go full out during battle, is one of the reasons they have a rather shaky relationship with the Chantry.

In the sequel, if playing as a mage, you can roam the streets at night exploding bandits with your awesome power. Not once will you ever be accosted for being a mage roaming freely through the streets. Which is forbidden. This is Hand Waved at a couple points, at first by your contacts and later by your social standing. Neither manages to save your sister, however.

You can chide Merrill for using blood magic when you first meet, and people will keep mentioning how she's dabbling in things she shouldn't be, even though the player might opt not to use any of her blood-related magic after that first scene. And at the same time, you can already have blood magic yourself, and thus start any battle by stabbing yourself brutally in the stomach and then keep on rolling by using people's own (still internal) blood against them in the most gruesome of fashions.

In Time Squad, Larry 3000 points out that kidnapping people from the past is forbidden (yes, he used that exact word), and they do it anyway. To be fair, kidnapping someone made them actually able to do their job properly.

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